The correct order of stability of hydrides of alkali metal is :

LiH > NaH > KH > RbH

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NaH > KH > RbH > LiH

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RbH > KH > NaH > LiH

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LiH > RbH > KH > NaH

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Solution

The correct option is A LiH > NaH > KH > RbH
The stability of hydrides decreases from LiH to CsH in the order LiH > NaH > KH > RbH > CsH. The hydride ion is a small ion. It forms stable compounds with small lithium ion. The stability decreases as the size of cation increases. This decreases the lattice energy of these hydrides.

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Question 3

Metal hydrides are ionic, covalent or molecular in nature. Among LiH,NaH, KH,RbH,CsH, the correct order of increasing ionic charcter is

(a) LiH > NaH > CsH > KH > RbH

(b) LiH < NaH < KH < RbH < CsH

(d) NaH > CsH > RbH > LiH > KH

L i H, N a H, K H, R b H

C s H

Match the following

A) Thermal stability order of hydrides 1) Na > K >Rb> Li > Cs

B) Ionic nature of hydrides 2) Li > Na > K >Rb> Cs

C) I.P₂ values order 3) CsH>RbH> KH >NaH>LiH

D) Abundance decreasing order 4) LiH>NaH> KH >RbH>CsH

N a H {C O}_{3}

K H {C O}_{3}

(K_{h})

25^{\circ} C ?

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